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There is a thread in the 73-79 section now. Info for upper is there but I dont know how that lower is gonna work for you. I had to sleeve mine on my 73 to gain some length downward.
Take a wire hanger and bend it to the shape you desire, then with the wire and OD dimensions of the inlet and outlet you should be able to match at your local parts house. Also measure thermostat housing neck and water pump making sure you have correct measurements for everything.
I pulled the radiator out of a 72 with a 360 and bolted it my 78 with 302 and hoses lined up perfectly. It was not a super cooling but everything lined up. If it was mine I would just try what was listed for the 460 like your original plan. I won't use flex hoses as I think they put to much bending force on the radiators.